为分析大型海藻对浮游动物群落结构及其粪便碳通量的影响，于2024年3月、5月和6月在广西涠洲岛马尾藻海藻场及其邻近对照海域进行了浮游动物群落结构调查，估算了浮游动物粪便碳通量，并于2024年5月马尾藻茂盛期利用环境DNA宏条形码对浮游动物群落进行了检测。调查期间基于形态分类学共鉴定浮游动物45种，其中桡足类38种，浮游动物丰度变化范围为1160~3960ind·m-3，马尾藻海藻场的浮游动物种类及其丰度均高于对照海域(P＜0.05)。通过形态学、18S rDNA和COI基因鉴定出的浮游动物种类组成有较大差异，其中形态学鉴定出较多的桡足类，18S rDNA检测出较多的纤毛虫，而COI基因检测出较多的水母类，综合三种方法共同检测到的种类为锥形宽水蚤(Temora turbinata)。浮游动物粪便碳通量的变化范围为0.215~0.574mg C·m−2·d−1，马尾藻海藻场浮游动物的粪便碳通量高于对照海域。调查结果表明，大型海藻马尾藻场的生态环境能够提高浮游动物的多样性和丰度，增加浮游动物粪便碳通量。

In order to analyse the effect of seaweed on zooplankton community structure and its fecal carbon flux, a morphology-based survey of zooplankton community structure was carried out in the Sargassum beds and its adjacent waters of Weizhou Island, Guangxi, in March, May and June 2024, and zooplankton fecal carbon flux was also estimated. In May 2024 when Sargassum bloom, the zooplankton community structure was examined by two types of environmental DNA metabarcoding (18S rDNA and COI gene). A total of 45 zooplankton species, including 38 copepods, were identified by morphology during the survey period. The zooplankton abundance varied from 1160 to 3960 ind. m-3, with the zooplankton species and abundance identified in the Sargassum beds being higher than that of its adjacent waters (P < 0.05). There were large differences in the composition of zooplankton species identified by morphology, 18S rDNA and COI gene, with more copepods identified by morphology, more ciliates detected by 18S rDNA, and more medusa species detected by COI gene. The species detected by all three methods was Temora turbinata. Zooplankton fecal carbon flux varied from 0.215 to 0.574 mg C m-2 d-1, and the zooplankton fecal carbon flux in the Sargassum beds were higher than that in its adjacent waters. The results showed that the growth of Sargassum can improve zooplankton diversity, increase the stability of zooplankton community structure, and increase zooplankton fecal carbon flux.